Masakiyo Tanaka
Fujitsu
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Publication
Featured researches published by Masakiyo Tanaka.
Journal of the Acoustical Society of America | 2007
Masanao Suzuki; Masakiyo Tanaka; Yasuji Ota; Yoshiteru Tsuchinaga
A voice intensifier capable of reducing abrupt changes in the amplification factor between frames and realizing excellent sound quality with less noise feeling by dividing input voices into the sound source characteristic and the vocal tract characteristic, so as to individually intensify the sound source characteristic and the vocal tract characteristic and then synthesize them before being output. The voice intensifier comprises a signal separation unit for separating the input sound signal into the sound source characteristic and the vocal tract characteristic, a characteristic extraction unit for extracting characteristic information from the vocal tract characteristic, a corrective vocal tract characteristic calculation unit for obtaining vocal tract characteristic correction information from the vocal tract characteristic and the characteristic information, a vocal tract characteristic correction unit for correcting the vocal tract characteristic by using the vocal tract characteristic correction information, and a signal synthesizing means for synthesizing the corrective vocal tract characteristic from the vocal tract characteristic correction unit and the sound source characteristic, so that the sound synthesized by the signal synthesizing means is output.
international conference on communications | 2002
Yausji Ota; Masanao Suzuki; Yoshite Ru Tsuchinaga; Masakiyo Tanaka; Shigeru Sasaki
As a novel technique for IP and 3G mobile integrated networks, we propose a speech coding translation scheme that can improve the speech quality of intercommunication among different speech coding standards, such as G.729 of VoIP and AMR of IMT-2000. Through the direct conversion of transmission parameters, this scheme improves speech intelligibility with reduced processing delay compared with conventional schemes, which consist of auxiliary decoding and asynchronous re-encoding. A subjective test by 40 non-experts shows that the proposed scheme significantly improves the subjective speech quality by a probability of 99%. And processing delay in one-way transmission is reduced by 25 ms.
Archive | 2003
Yasuji Ota; Masanao Suzuki; Yoshiteru Tsuchinaga; Masakiyo Tanaka; Shigeru Sasaki
Archive | 2005
Yoshiteru Tsuchinaga; Yasuji Ota; Masanao Suzuki; Masakiyo Tanaka; Miyuki Shirakawa
Archive | 2011
Yoshiteru Tsuchinaga; Yasuji Ota; Masanao Suzuki; Masakiyo Tanaka; Joe Mizuno
Archive | 2006
Takashi Makiuchi; Masanao Suzuki; Takeshi Otani; Masakiyo Tanaka
Archive | 2005
Masanao Suzuki; Masakiyo Tanaka; Yasuji Ota; Yoshiteru Tsuchinaga
Archive | 2003
Takashi Ota; Masanao Suzuki; Masakiyo Tanaka; Yoshiteru Tsuchinaga; 義照 土永; 恭士 大田; 正清 田中; 政直 鈴木
Archive | 2009
Masakiyo Tanaka; Masanao Suzuki; Yasuji Ota
Archive | 2002
Masanao Suzuki; Yasuji Ota; Yoshiteru Tsuchinaga; Masakiyo Tanaka